Comparing Retool, Airtable, chatbot builders, and Remy for expense, vendor, PTO, and procurement approval workflows — what each actually ships.
What’s the Best AI Platform for Building an Approval Workflow? #
For teams that want a real backend, roles, and an audit trail without hiring an engineer, Remy is the strongest fit — it compiles a plain-language spec into a deployed full-stack app, with approval logic, roles, and a database included from the first build. For teams that already have engineers on staff and just need a fast internal UI on top of existing data, Retool is a reasonable choice. For a lightweight tracker with no real logic, Airtable can work as a stopgap. This piece compares all three, plus generic AI chatbot builders, against the actual shape of approval workflows: expense sign-off, vendor onboarding, PTO requests, and procurement.
TL;DR #
- Approval workflows share a common shape — a request, a routing rule, a series of reviewers, and a record of who approved what and when — which is why the same handful of tools keep showing up for expense, vendor, PTO, and procurement use cases. - Remy builds the whole thing from a plain-language description, including a real backend with roles enforced server-side, not just a form connected to a spreadsheet. - Retool is fast when a team already has engineers and existing data sources to wire into a UI, but building the approval logic itself is still manual work. - Airtable and Zapier-style stacks work for the simplest one-step approvals but strain fast once a workflow needs branching logic, multiple reviewer tiers, or a permanent audit trail. - Generic AI chatbot builders can draft a mockup of an approval flow in a conversation, but most don’t ship a persistent database or enforced roles, so the “approval” step isn’t actually gated by anything. - A Remy-built approval tool is standard TypeScript in a git repo the organization owns, so the org isn’t locked into a subscription to keep running software it already paid to build. - Building a working approval workflow in Remy is typically a token cost on top of the platform subscription, not a new line item per department that wants one. - The right tool depends on whether the team wants a real, ownable backend(Remy) or a fast UI on infrastructure it already runs (Retool) — not which one is objectively “more AI.”
Everyone else built a construction worker.
We built the contractor.
One file at a time.
UI, API, database, deploy.
What Does an Approval Workflow Actually Need? #
Strip away the specific use case — expense reports, vendor onboarding, PTO, procurement — and every approval workflow needs the same handful of parts. A request gets submitted. It routes to the right reviewer, sometimes more than one in sequence. Each reviewer can approve, reject, or kick it back for more information. And somewhere, permanently, there’s a record of who did what and when.
That last part is where a lot of “quick internal tool” builds quietly fail. A form-to-spreadsheet approval flow has no real roles — anyone with the link can approve anything — and no durable audit trail once the spreadsheet gets overwritten or deleted. The tools below differ mainly in how seriously they take that gap.
How Do the Main Options Compare? #
| Platform | What it actually builds | Backend & roles | Best fit | Pricing model |
|---|---|---|---|---|
| Remy | A deployed full-stack app from a plain-language spec | Real database, server-side roles, audit log included | Multi-step approvals with real governance needs | Flat platform subscription + token cost per build |
| Retool | An internal UI wired to your existing databases/APIs | You bring the backend; Retool renders and gates the UI | Teams with engineers and data already in a warehouse or DB | Retool’s published per-user pricing |
| Airtable + automation | A record table with status fields and notification rules | No real roles — access controlled by base permissions, not app logic | Single-step approvals, low stakes | Airtable’s published plan pricing |
| Generic AI chatbot builder | A conversation that can draft workflow logic or a mockup UI | Usually no persistent backend or enforced roles | Prototyping the idea before building it for real | Varies by provider |
The pattern across the table: most of these tools are strong at one piece of the problem — Retool at the UI layer if the backend already exists, Airtable at the record-keeping if the logic stays simple, a chatbot at drafting the idea — and weak at the piece that makes an approval workflow actually enforceable: a backend with real roles, not just a UI that looks gated.
Why Does Remy Handle Multi-Step Approvals Differently? #
Most approval workflows aren’t one gate — they’re several. An expense over a threshold needs a manager’s sign-off, then finance’s. A new vendor needs procurement, then legal, then finance. Remy is a product agent: describe the workflow in plain language — “requests over $5,000 route to a director, then to finance; anyone can see their own request status but only reviewers can approve” — and Remy drafts a spec covering the roles, the routing, and the data model, then builds the actual app: real authentication, a database with per-tenant isolation, and roles enforced in the generated backend, not just hidden by a UI toggle.
That’s the durable difference against tools that generate a frontend and stop. If a reviewer’s permissions live only in the UI, anyone who can see the API can approve anything. Remy enforces roles server-side, which is the difference between an approval flow that looks gated and one that actually is.
- ✕a coding agent
- ✕no-code
- ✕vibe coding
- ✕a faster Cursor
The one that tells the coding agents what to build.
Specialist sub-agents build the app together — covering design, the data model, and testing the actual click-through flow in a browser before it ships — so the workflow arrives as a working app rather than a wireframe. For a closer look at what this produces in practice, 10 Real Apps Built on Remy walks through shipped examples, several of them internal tools in this same shape. And for teams asking whether a coding agent could do this instead, Remy vs Cursor: When You Need a Product Agent, Not a Coding Agent covers the difference in workload, not workflow order — coding agents and product agents are for different jobs. The engineers on staff can keep using Cursor or Claude Code for the codebases they already own; that’s a separate tool for a separate job, not a step before or after building the approval workflow itself.
Which Approval Use Cases Fit Best? #
Expense approvals. A request, a threshold-based routing rule, a manager and finance sign-off, and a running total against budget. Straightforward for any of these tools, but only Remy and Retool give you a real audit trail without extra plumbing.
Vendor onboarding. More reviewers (procurement, legal, finance), more fields (tax ID, contract terms, compliance docs), and usually a requirement to keep records for years. This is where spreadsheet-and-form stacks fall apart — there’s real data governance at stake. Organizations with SSO requirements can federate reviewers over SAML or OIDC, so identity stays with the company’s existing provider and deprovisioning takes effect the moment someone leaves.
PTO and time-off requests. Usually one reviewer, sometimes two for larger blocks. Lower stakes, so this is the one case where a simpler tool like Airtable can genuinely be enough, at least until the team wants to layer in accrual balances or blackout dates.
Procurement sign-off. Often the most complex: dollar-threshold routing, multiple departments, sometimes a legal review step. This is closest to what companies otherwise buy a dedicated procurement SaaS product for — see Five Internal Tools You Can Ship with AI in an Afternoon (and What Each One Costs) for a similar cost and time breakdown on a vendor-approval-shaped build.
What Do You Actually Own When the Workflow Ships? #
This is the part that gets skipped in most comparisons, and it matters more over time than which tool built the first version. A workflow built in Airtable or a no-code automation stack lives inside that vendor’s subscription — stop paying, and the tool (and its history) is gone. A Retool app is portable in the sense that the underlying data usually lives in your own database, but the app definition itself lives inside Retool.
A Remy-built app is standard TypeScript in a git repo. If a team ever wanted to leave, the code, the spec, and the data all move with it — there’s no proprietary format holding the approval logic hostage. That’s a meaningfully different position for something that ends up handling real financial or legal sign-off over years, not weeks. For governance-heavy builds, Remy also ships an immutable audit log, SSO and SAML support, PII detection, and SOC 2 and GDPR compliance — the same bar a team would otherwise clear by buying a dedicated procurement or GRC product.
How Much Does It Cost to Build One? #
Remy runs on a flat platform subscription — $99/mo, or $79/mo billed annually — with token costs for a build billed at provider rates on top. Building a full project from idea to deployed app typically runs $100–500 in tokens, and an approval workflow tends to fall in the same range as any other moderately complex internal tool.
Built like a system. Not vibe-coded.
Remy manages the project — every layer architected, not stitched together at the last second.
Retool and Airtable price per user or per workspace tier, and neither includes the engineering time to wire up the actual approval logic — that’s a separate cost, usually in hours, not tokens. A generic AI chatbot builder is often free or cheap to prototype in, but the moment the workflow needs to be real — enforced roles, a durable record, a live URL a manager can actually click into — most of these builders hand the work back to an engineer anyway.
What Is Remy? #
Remy builds and runs the software your team would otherwise rent. Describe what you need, and it ships as standard TypeScript in a git repo you own.
App builders and chatbot-style prototyping platforms are prompt-driven code generators — you chat, they emit code, and you keep re-prompting to patch what comes out. Remy is spec-driven: the plain-language description compiles into a spec, and the spec is the source of truth, with the app itself as compiled output. That distinction is what makes roles, a real database, and an audit log a default part of the build rather than something bolted on afterward. Try Remy on a real approval workflow, or read What Is a Product Agent? The AI That Ships a Whole App, Not Code for more on how the category differs from chat-based code editors and prototyping tools, and Remy vs Lovable: Only One Ships a Native Full Stack for a closer architectural comparison. For more on why the spec becomes the source of truth, see What Is Spec-Driven Development?.
FAQ #
Can I build a multi-step approval workflow without an engineer? Yes. Remy drafts a spec from a plain-language description of the workflow — who submits, who approves, and in what order — and builds the working app, including roles and a database, without requiring anyone to write code.
Does Airtable work for approval workflows?
For single-step, low-stakes approvals like PTO requests, Airtable plus its automation rules can be enough. It strains once a workflow needs branching approval tiers, enforced roles, or a permanent audit trail. Is Retool a good fit for approval tools? Retool is strong when a team already has engineers and existing data sources — it renders a fast internal UI on top of infrastructure that already exists. Building the actual approval logic and data model is still manual work.
Can a generic AI chatbot build an approval workflow? A chatbot can draft the logic or mock up a UI in conversation, but most don’t ship a persistent database or server-side roles, so nothing is actually enforced once the workflow goes live.
What does it cost to build an approval workflow with Remy? Remy’s platform subscription is $99/mo, or $79/mo billed annually, with token costs for a build billed at provider rates on top — an approval workflow tends to land in the same range as any other moderately complex internal tool.
Who owns the app once it’s built? With Remy, the organization does — every app is standard TypeScript in a git repo, exportable at any time. Tools like Airtable or no-code automation stacks keep the workflow inside their own subscription.
Does the workflow support multiple reviewer tiers? Yes — Remy can build routing rules with multiple sequential reviewers (for example, manager then finance), with roles enforced in the generated backend rather than hidden behind a UI toggle.
#
Plans first. Then code.
Remy writes the spec, manages the build, and ships the app.
How does Remy stay useful as AI models improve? The spec is the source of truth. As underlying models improve, recompiling the spec upgrades the app without a rebuild from scratch.
What happens to the tool if the person who built it leaves? Because the app and its spec live on the organization’s account rather than a personal one, the tool keeps running and a spec describing what it does is there for whoever picks it up next.
The Bottom Line #
Approval workflows look simple until the second reviewer tier or the first audit request. Retool and Airtable both solve pieces of the problem well, but they leave the actual approval logic — real roles, a real record, real enforcement — as someone’s manual work. Remy builds that logic in from the description forward, so the workflow is a real, owned application rather than a form with a spreadsheet behind it.
Remy builds and runs the software your team would otherwise rent. Describe what you need, and it ships as standard TypeScript in a git repo you own.