Social media · United States · USD
Cost to build an app like Reddit
A Reddit-like app is a community platform, and community platforms live or die on their moderation tools. Threaded comments with voting are a well-understood engineering problem; giving thousands of volunteer moderators the tooling to run their own spaces, with their own rules, is the part that takes real time.
What you are actually building
An app like Reddit 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.
The feed
Fan-out, pagination, caching and read state. A feed still fast past a few thousand follows is a backend problem, not a UI one.
Media upload
Client-side compression, resumable uploads, transcode, thumbnails and a CDN. The upload path fails in more ways than any other screen.
Moderation
Reporting, review queues, automated classification and appeals. Not optional the moment strangers can post to each other.
Price your own version
The calculator below is preloaded with the Reddit 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 Reddit
A starting template, not a specification. Every feature, number and technology choice below is yours to change.
Reference template
A Reddit-like app is a community platform, and community platforms live or die on their moderation tools. Threaded comments with voting are a well-understood engineering problem; giving thousands of volunteer moderators the tooling to run their own spaces, with their own rules, is the part that takes real time.
- Preloaded features
- 16
- Category
- Social media
The feed
Fan-out, pagination, caching and read state. A feed still fast past a few thousand follows is a backend problem, not a UI one.
Media upload
Client-side compression, resumable uploads, transcode, thumbnails and a CDN. The upload path fails in more ways than any other screen.
Moderation
Reporting, review queues, automated classification and appeals. Not optional the moment strangers can post to each other.
What makes a Reddit-like app expensive
Three things dominate this shape of product. Everything else is comparatively ordinary app development.
Threaded comments at depth
Deeply nested threads with sorting, collapsing, pagination and live vote counts is a harder data-access problem than a flat comment list.
Ranking
Hot, top, new, controversial and rising are each a different scoring function over a moving time window.
Moderator tooling
Per-community rules, automated filters, mod queues, bans and appeals. Effectively an admin product built for people outside your company.
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 Reddit-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 (14)
714h totalAdvanced features (2)
291h totalIntegrations (5)
- AWS
- Amplitude / Mixpanel
- AppsFlyer / Adjust (attribution)
- Sentry / Datadog (monitoring)
- Firebase Cloud Messaging
How long, and who builds it
The $656,000–$1,072,000 figure assumes this schedule and this team. Both scale with the answers in the calculator above — and neither is a quote.
Delivery timeline — 9–12 months
- Discovery & product definition4–5 wks
- UI/UX design6–8 wks
- Development (app + backend)20–28 wks
- Integrations & infrastructure5–7 wks
- QA & security testing5–7 wks
- Store submission & launch2–3 wks
The team — 7 people
- Product manager1×
- UI/UX designer1×
- Mobile developer1×
- Backend developer1×
- DevOps / SRE1×½
- QA engineer1×
- Data / ML 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. 7 people is about 6.5 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 15% 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 Reddit runs.
| Layer | Suggestion |
|---|---|
| Mobile | Native iOS and Android — camera, media handling and scroll performance decide retention |
| Backend | Go or Node.js services with a dedicated feed-generation service |
| Database | PostgreSQL for accounts, Cassandra or DynamoDB for the timeline and social graph |
| Cache | Redis for feed pages, counters and sessions |
| Search | OpenSearch for people, hashtags and places |
| Real-time | WebSocket for messaging and live presence |
| Cloud | AWS |
| Object storage | S3 for original and derived media |
| CDN | CloudFront with on-the-fly image transforms |
| Media pipeline | Image and short-video processing pipeline with automatic moderation screening |
| Monitoring | Datadog with feed-latency and moderation-queue dashboards |
| ML serving | A managed inference endpoint (SageMaker, Vertex AI) with an offline evaluation pipeline |
Top cost drivers
- 1
Medium scale traffic and usage20% of the build
Caching, queues and real monitoring become mandatory. That is real engineering: caching layer (redis or equivalent) in front of hot reads; background job queue for anything slower than a request; read replicas and query-level database tuning. Lower your year-one traffic assumptions and this shrinks immediately.
- 2
Advanced backend architecture10% of the build
Needed when traffic is high enough, or spiky enough, that a single service cannot absorb it and a slow endpoint takes the whole product down with it.
- 3
iOS + Android, native5% 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.
- 4
5 third-party integrations4% 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.
- 5
Premium design3% of the build
Roughly 25 screens with research, motion and accessibility work. Dropping to Custom would save a meaningful share of this without making the product look unfinished.
- 6
COPPA compliance work2% 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.
Infrastructure and maintenance
Neither of these is part of the build figure, and neither of them stops.
Cloud infrastructure
$2K – $11K/month
- Baseline environment$120–$420
- Application compute$675–$2,400
- Database$27–$108
- Object storage$105–$130
- CDN & bandwidth$36–$82
- Media transcoding$25–$67
Annual maintenance
$98K – $268K/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 Reddit — common questions
How much does it cost to build an app like Reddit?
Using this site's default profile — 16 features, ios + android, native, a advanced backend and medium scale traffic — the estimate is $656,000 to $1,072,000 for a US team, or roughly 6,177 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 Reddit?
About 9–12 months with the team this estimate assumes — 7 people, roughly 6.5 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 Reddit?
1× product manager, 1× ui/ux designer, 1× mobile developer, 1× backend developer, 1× devops / sre (part-time), 1× qa engineer, 1× data / ml engineer. That is what 6,177 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 15% of this build.
What does an app like Reddit cost to run each month?
Cloud infrastructure is estimated at $1,528 to $11,057 per month at the scale this profile assumes, driven mainly by media delivery and transcoding. Third-party services add $380 to $7,500. Separately, budget $98,000 to $268,000 a year for maintenance — bug fixes, OS and SDK updates and security patching. None of these are part of the build figure.
How much is the moderation layer?
Automated screening plus mod queues, rules and appeals runs 250–400 hours for a community platform. It is the single largest non-obvious line item in this shape.
Do votes need to be real-time?
They need to feel instant, which is not the same thing. Optimistic client updates over an eventually-consistent counter is the standard approach and it is far cheaper than strict real-time consistency.