Productivity · United States · USD
Cost to build an app like Trello
A Trello-like app is the most tractable shape in this library. A board with lists and cards is a well-understood model, and the interaction — drag a card, everyone sees it move — is satisfying without being architecturally difficult. It is a genuinely achievable first product.
What you are actually building
An app like Trello is three or four screens people recognise sitting on a great deal of engineering they never see. These are the screens that define the shape — and the part of each one that costs real money.
Boards and drag
Sixty-frames-a-second drag and drop with optimistic updates, and a server that has to resolve two people moving the same card.
Sync and offline
A conflict-resolution model, a local store and a sync engine. This is the hardest thing in a productivity app by a wide margin.
Teams and permissions
Workspaces, roles, invites, SSO and an audit trail — the work that turns an app into something a company is allowed to buy.
Price your own version
The calculator below is preloaded with the Trello template — its features, architecture and a planning scale for year one. Remove what you do not need, add what you do, and the estimate follows.
Building an app like Trello
A starting template, not a specification. Every feature, number and technology choice below is yours to change.
Reference template
Trello
A Trello-like app is the most tractable shape in this library. A board with lists and cards is a well-understood model, and the interaction — drag a card, everyone sees it move — is satisfying without being architecturally difficult. It is a genuinely achievable first product.
- Preloaded features
- 12
- Category
- Productivity
Boards and drag
Sixty-frames-a-second drag and drop with optimistic updates, and a server that has to resolve two people moving the same card.
Sync and offline
A conflict-resolution model, a local store and a sync engine. This is the hardest thing in a productivity app by a wide margin.
Teams and permissions
Workspaces, roles, invites, SSO and an audit trail — the work that turns an app into something a company is allowed to buy.
What makes a Trello-like app expensive
Three things dominate this shape of product. Everything else is comparatively ordinary app development.
Drag and drop
Smooth reordering on touch with optimistic updates and a position model that survives concurrent moves without renumbering everything.
Real-time board sync
Changes appearing for everyone within a second, which is a lighter real-time requirement than collaborative text editing.
Automation
Rule-based automation — when a card moves here, do that — is the common upgrade path and a meaningful add-on.
Cost breakdown for the default template
Before you change anything. Costed at the midpoint of a $118–$155/hr blended US rate.
Features in a Trello-like app
The starting list, longest build first — each bar is that feature’s share of the biggest one, so you can see where the hours actually go. Every row is a checkbox in the calculator above: this is a template, not a specification.
Core features (11)
518h totalAdvanced features (1)
162h totalIntegrations (6)
- Stripe
- SendGrid / Resend (email)
- Auth0 / Okta
- AWS
- Amplitude / Mixpanel
- Sentry / Datadog (monitoring)
How long, and who builds it
The $447,000–$731,000 figure assumes this schedule and this team. Both scale with the answers in the calculator above — and neither is a quote.
Delivery timeline — 8–11 months
- Discovery & product definition4–5 wks
- UI/UX design6–8 wks
- Development (app + backend)18–25 wks
- Integrations & infrastructure5–7 wks
- QA & security testing5–7 wks
- Store submission & launch2–3 wks
The team — 5 people
- Product manager1×½
- UI/UX designer1×
- Mobile developer1×
- Backend developer1×
- QA engineer1×
The phases add to more than the total on purpose: design starts before discovery finishes and QA runs alongside development rather than after it. 5 people is about 4.5 full-time equivalents — a smaller team takes proportionally longer, and a much larger one does not go proportionally faster. The two roles most often missing from a first plan are DevOps and QA, which together are 14% of this build.
Technology considerations
A stack that would serve this product shape well. A recommendation for what you could build — not a claim about what Trello runs.
| Layer | Suggestion |
|---|---|
| Mobile | A shared cross-platform codebase for mobile plus a web client, since most work happens on a desktop |
| Backend | Node.js or Go services with a document/collaboration service split out |
| Database | PostgreSQL, with document state stored as an append-only operation log |
| Cache | Redis for presence and session state |
| Search | OpenSearch across documents, with per-tenant index isolation |
| Real-time | WebSocket with CRDT or OT for concurrent editing |
| Cloud | AWS |
| Object storage | S3 for attachments and file uploads |
| Monitoring | Datadog with sync-conflict and API-latency dashboards |
Top cost drivers
- 1
6 third-party integrations7% of the build
Every external service is code you write, failure modes you handle and an API that will change without asking you. The ones you can defer are the cheapest scope cuts available.
- 2
SOC 2 Type II compliance work7% of the build
Engineering and evidence work to make an audit survivable. Certification fees, legal review and auditor time are separate costs that this estimate excludes.
- 3
Cross-platform + web app4% of the build
Two separate native codebases means the client is built twice. Moving to React Native or Flutter would cut roughly a third of your mobile hours, at the cost of native modules wherever you touch device hardware.
Infrastructure and maintenance
Neither of these is part of the build figure, and neither of them stops.
Cloud infrastructure
$651 – $7K/month
- Baseline environment$120–$420
- Application compute$54–$192
- Database$7–$27
- Object storage$8–$10
- CDN & bandwidth$2–$5
- Caching layer$60–$700
Annual maintenance
$67K – $183K/year
15–25% of build cost per year: bug fixes, iOS and Android version updates, SDK and dependency upgrades, security patching and small improvements. Cloud costs are the separate figure alongside.
Building an app like Trello — common questions
How much does it cost to build an app like Trello?
Using this site's default profile — 12 features, cross-platform + web app, a standard backend and small scale traffic — the estimate is $447,000 to $731,000 for a US team, or roughly 4,213 engineering hours at a blended $118–$155 per hour. That figure covers design, both apps, backend, infrastructure, integrations, security, QA, DevOps and project management. It excludes cloud hosting, vendor fees, marketing and legal. Change any answer in the calculator on this page and the number moves with it.
How long does it take to build an app like Trello?
About 8–11 months with the team this estimate assumes — 5 people, roughly 4.5 full-time equivalents. Discovery and design run first and partly in parallel, development takes about half the calendar, and QA overlaps the back half rather than following it. A smaller team takes proportionally longer; a much larger one does not go proportionally faster, which is why compressing this schedule costs more than it saves below a certain point.
What team do you need to build an app like Trello?
1× product manager (part-time), 1× ui/ux designer, 1× mobile developer, 1× backend developer, 1× qa engineer. That is what 4,213 hours of work distributed across 10 disciplines actually requires. The roles people most often leave out of their own plan are DevOps and QA, which together are about 14% of this build.
What does an app like Trello cost to run each month?
Cloud infrastructure is estimated at $651 to $6,904 per month at the scale this profile assumes, driven mainly by compute and database. Third-party services add $340 to $8,000. Separately, budget $67,000 to $183,000 a year for maintenance — bug fixes, OS and SDK updates and security patching. None of these are part of the build figure.
What would a Trello-like app cost?
Boards, lists, cards, members, comments, attachments and real-time sync across iOS, Android and web price at roughly $440,000–$730,000 at US agency rates — the web client is a third of that on its own. Drop the web client and use a small team and it is nearer $180,000–$320,000. It remains one of the few shapes here where a small team can genuinely ship a competitive first version.
Is real-time sync necessary?
For a team tool, yes. Polling every few seconds is cheaper but it feels broken when two people work on the same board. A WebSocket layer for board updates is around 105 hours and worth every one of them.