What is App Stack Builder?

App Stack Builder is a free AI-powered tool that helps founders and developers choose the right tech stack for their projects based on budget, app type, team size, and skill level.

What is the best tech stack for SaaS in 2026?

The best tech stack for SaaS in 2026 typically includes Next.js 16 for frontend, Supabase for database and auth, Vercel for hosting, Stripe for payments, and PostHog for analytics. App Stack Builder can generate a personalized recommendation based on your specific budget and requirements.

Is App Stack Builder free to use?

Yes, App Stack Builder is completely free to use. You can generate unlimited tech stack recommendations without any cost.

What types of apps can I build with the recommended stacks?

App Stack Builder supports various app types including SaaS applications, web apps, mobile apps, e-commerce stores, internal tools, and AI/ML products.

How much does a SaaS tech stack cost per month?

A modern SaaS tech stack can cost anywhere from $0-50/month for bootstrapped startups using free tiers, $100-300/month for growth-stage startups, to $500+/month for enterprise-ready infrastructure. App Stack Builder helps you find the best tools within your specific budget.

What is the best tech stack for solo founders?

For solo founders, we recommend Next.js + Vercel (free), Supabase (free tier), Supabase Auth (free), Stripe (pay as you go), and Plausible or PostHog for analytics. This stack can run your entire SaaS for under $50/month.

Can I export my tech stack recommendations?

Yes, you can export your tech stack recommendations as a PDF document or copy them to your clipboard. You can also share a link to your stack with others.

River vs Temporal: Which is Better in 2026?

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Background Jobs & Workflows

Choosing between River and Temporal? Both are popular background jobs & workflows tools. Below we compare them on pricing, free tiers, features, and pros & cons so you can pick the right fit for your stack.

River is for: Go teams on PostgreSQL who want jobs enqueued in the same transaction as their data.

Temporal is for: Engineering teams running long-lived business workflows across services and languages who need them to survive crashes and restarts.

Quick verdict

There’s no single winner; pick on your constraint. Choose River if your app is written in Go and uses Postgres. Choose Temporal if your workflows run for days or months and must resume exactly where they stopped after a failure.

River vs Temporal — Side by Side

	River	Temporal
Category	Background Jobs & Workflows	Background Jobs & Workflows
What it is	Open-source job queue library	Durable execution platform
Languages	Go, Java, Ruby, Rust, TypeScript	Go, Java, .NET, PHP, Python, Ruby, Rust, TypeScript
What it runs on	Your Postgres or SQLite	Temporal Cloud or self-hosted server
How you pay	Free (MPL-2.0); optional Pro subscription	Per million Actions plus storage; no base fee
Free access	Full open-source library	Open source; $150 Cloud credit for 90 days
Pricing	Free · paid from $125/mo	Free · then usage-based
Starting price	Free tier available	Free tier available
Free tier
Rating	4.4	4.5
Best for	Background Jobs & Workflows — Go, Postgres, transactional jobs	Background Jobs & Workflows — durable execution, long-running workflows, polyglot teams

Pros & Cons

River

Idiomatic Go with strong typing
Transactional enqueue on Postgres
No separate broker needed
Active development

Go-first; other languages are newer
Newer than incumbents
Needs Postgres or SQLite

Temporal

Battle-tested durable execution
Polyglot SDKs
Handles very complex, long-running workflows
Strong reliability guarantees

Steep learning curve
Self-hosting is operationally heavy
Cloud Action-based pricing can be hard to predict

Key Features Compared

River

Open source under the MPL-2.0 license
Enqueues jobs transactionally in your existing database
Runs on Postgres and SQLite
Background jobs for Go, Java, Ruby, Rust and TypeScript, per the project site
River Pro: $125 a month; annual billing saves $300
Pro adds workflows, sequences, batching, global concurrency limits, a dead letter queue and encrypted jobs

Temporal

Open-source server under the MIT license; self-host it yourself
Temporal Cloud pay-as-you-go: no base fee, Actions from $50 per million
Active storage $0.042 per GB-hour; retained storage $0.00105 per GB-hour
$150 of free Cloud credit for 90 days
Business support from $500 a month or 10% of usage, with 2.5M Actions included
99.9% SLA, with a 99.99% high-availability option

Choose River if…

Your app is written in Go and uses Postgres.
You want a job to exist only if the transaction that created it commits.
You want workflows and concurrency limits for a flat monthly fee.

River review & pricing

Choose Temporal if…

Your workflows run for days or months and must resume exactly where they stopped after a failure.
Your services are written in several languages and need to share one workflow engine.
You want the option to run the open-source server yourself or pay per Action on Temporal Cloud.

Temporal review & pricing

Frequently Asked Questions

Is River better than Temporal?⌄

What is the difference between River and Temporal?⌄

What it is — River: Open-source job queue library. Temporal: Durable execution platform. Languages — River: Go, Java, Ruby, Rust, TypeScript. Temporal: Go, Java, .NET, PHP, Python, Ruby, Rust, TypeScript. What it runs on — River: Your Postgres or SQLite. Temporal: Temporal Cloud or self-hosted server. How you pay — River: Free (MPL-2.0); optional Pro subscription. Temporal: Per million Actions plus storage; no base fee. Free access — River: Full open-source library. Temporal: Open source; $150 Cloud credit for 90 days.

River vs Temporal: which is cheaper?⌄

River pricing: Free · paid from $125/mo. Temporal pricing: Free · then usage-based. Confirm current pricing on each tool's official site, as plans change.

Which is rated higher, River or Temporal?⌄

In our catalog, River rates 4.4 out of 5 and Temporal rates 4.5 out of 5, so Temporal has a slight edge on reviews.

When should I skip both River and Temporal?⌄

Skip River if your app is in Node.js. Graphile Worker takes the same Postgres approach. Skip Temporal if you need simple queued jobs. BullMQ, Sidekiq or Celery are less to learn and run.

Sources · tool facts checked November 2026