AI Stacks
The best pairings for going agentic — picked by evidence, not vibes. Every scored slot below is the current #1 of its arena on the named metric, resolved live from the same rankings as the rest of the site; slots we can’t score yet are labeled as editorial picks.
Build your own →Get upgrades for the stack you run →Battle of the stacks →
Local sovereign stack
Battle this stack →Fully agentic on your own hardware — no cloud dependency, no data leaves the desk.
For: Privacy-first builders and tinkerers who want agents running on metal they own.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| Operating system The OS is the agent's floor: shell access, scriptability, package management. | too close to call (Δ2.6) — either is a strong pick | top two of 5 in Desktop OS by agent-ready | 18/100 · full arena |
| Local LLM runtime Serves the model to every agent on the box — throughput and OpenAI-compat API matter most. | too close to call (Δ2.7) — either is a strong pick | top two of 7 in Local LLM Runtimes by agent-ready | 56/100 · full arena |
| Local model The brain. Pick by VRAM budget; coding-tuned open-weight models close most of the gap to hosted frontier models for agent loops. | Qwen3-Coder / DeepSeek-V3.2 / Llama 4 (by VRAM budget) ↗ | Editorial pick — models aren't an arena yet, so this slot is judgment, not judged. | editorial |
| Hardware Unified memory is the local-agent bottleneck: fit the biggest model you can hold in fast memory. | Mac Studio (128GB+ unified) or Linux box with RTX 5090 / dual 4090 ↗ | Editorial pick — hardware isn't an arena yet, so this slot is judgment, not judged. | editorial |
| Coding agent The hands. Point it at the local runtime's OpenAI-compatible endpoint. | runner-up: | #1 of 13 in AI Coding Agents by agent-ready | 69/100 · full arena |
Agentic founder stack
Battle this stack →Run a startup where your agents do the ops: banking, planning, shipping, and listening.
For: Founders who want every operational tool reachable by their agents, not just by hand.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| Banking & finance Agents that can read balances, categorize transactions, and draft payments via API/MCP. | runner-up: | #1 of 5 in Startup Banking by agent-ready | 76/100 · full arena |
| Project management Where agents file, triage, and update work items alongside the team. | too close to call (Δ2.2) — either is a strong pick | top two of 6 in Project Management by agent-ready | 59/100 · full arena |
| Code hosting PRs, issues, and CI an agent can drive end-to-end. | runner-up: | #1 of 4 in Code Hosting by agent-ready | 71/100 · full arena |
| Coding agent The engineering multiplier — ships against the repo above. | runner-up: | #1 of 13 in AI Coding Agents by PA Score | 47/100 · full arena |
| Customer feedback Agents that mine intent from user feedback and route it into the PM tool. | runner-up: | #1 of 3 in Product Feedback & Intent by agent-ready | 51/100 · full arena |
| Payroll Agents that run payroll previews, onboard hires, and reconcile journals via API/MCP. | too close to call (Δ2.2) — either is a strong pick | top two of 4 in Payroll & HR Ops by agent-ready | 59/100 · full arena |
Agent builder stack
Battle this stack →Everything an agent needs to see, fetch, run, and ship on the open web.
For: Developers building agents that act on the world: scrape it, deploy to it, front it.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| Web data & scraping Agents need eyes — structured extraction from any URL. | runner-up: | #1 of 8 in Web Scraping APIs by agent-ready | 62/100 · full arena |
| Edge & app platform Where the agent's own services deploy and run. | runner-up: | #1 of 6 in Edge & App Platforms by agent-ready | 79/100 · full arena |
| Frontend framework The surface the agent generates UI with — docs quality and conventions agents can follow. | too close to call (Δ2.7) — either is a strong pick | top two of 5 in Frontend Frameworks by PA Score | 37/100 · full arena |
| Coding agent Builds and maintains the whole thing. | runner-up: | #1 of 13 in AI Coding Agents by agent-ready | 69/100 · full arena |
| Local eval runtime Cheap local inference for testing agent loops before burning hosted tokens. | too close to call (Δ2.8) — either is a strong pick | top two of 7 in Local LLM Runtimes by PA Score | 32/100 · full arena |
Mobile agentic stack
Battle this stack →Drive your agents and infrastructure from a phone — the pairing people actually run.
For: Operators who want to supervise agents, repos, and servers from anywhere.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| Mobile terminal The SSH client you live in — keys, snippets, and port forwarding on the phone. | Curated pairing: Termius + Tailscale bind together in practice — the terminal rides the mesh network's stable IPs, so your agent boxes are reachable from anywhere without exposing ports. | 18/100 · #1 of 6 · full arena | |
| Private mesh network Every agent box, home server, and laptop on one flat private network. | Curated pairing: the other half of the Termius bind — SSH targets get stable MagicDNS names; nothing is exposed to the public internet. | 16/100 · #2 of 6 · full arena | |
| Code hosting Review and merge the agent's PRs from the phone. | runner-up: | #1 of 4 in Code Hosting by agent-ready | 71/100 · full arena |
| Coding agent Kick off runs remotely; check results when they land. | runner-up: | #1 of 13 in AI Coding Agents by agent-ready | 69/100 · full arena |
API-first team stack
Battle this stack →Design, test, gate, and ship APIs that agents consume as first-class clients.
For: Teams whose product is an API — and who want agents driving the whole lifecycle.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| API platform Collections, testing, mocking, and gateway — the API team's home base. | runner-up: | #1 of 5 in API platforms by PA Score | 40/100 · full arena |
| Code hosting Spec-first reviews and CI contract tests an agent can drive. | runner-up: | #1 of 4 in Code Hosting by agent-ready | 71/100 · full arena |
| Edge & app platform Where the API actually serves from. | runner-up: | #1 of 6 in Edge & App Platforms by agent-ready | 79/100 · full arena |
| Coding agent Writes the handlers, keeps the OpenAPI spec honest. | runner-up: | #1 of 13 in AI Coding Agents by agent-ready | 69/100 · full arena |
Open-source sovereign stack
Battle this stack →Every layer open source — auditable, self-hostable, fork-proof.
For: Teams with a hard open-source requirement who still want maximum agent leverage.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| Coding agent The best agent you can read the source of. | runner-up: | #1 of 5 in AI Coding Agents by agent-ready | 62/100 · full arena |
| Software factory Autonomous end-to-end development, self-hosted. | runner-up: | #1 of 3 in Software Factory by PA Score | 50/100 · full arena |
| Local LLM runtime Open weights on open serving. | runner-up: | #1 of 6 in Local LLM Runtimes by agent-ready | 53/100 · full arena |
| Code hosting Your repos on your metal. | #1 of 1 in Code Hosting by agent-ready | 34/100 · full arena | |
| Web data & scraping Open extraction for agent eyes. | runner-up: | #1 of 3 in Web Scraping APIs by agent-ready | 54/100 · full arena |
| API client Git-native, offline API workflows. | runner-up: | #1 of 3 in API platforms by agent-ready | 45/100 · full arena |
Financial ops stack
Battle this stack →The founder money stack: bank, get paid, pay people, close the books — all agent-reachable.
For: Founders and finance leads who want agents doing the monthly grind.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| Banking Balances, transactions, and payment drafting via API/MCP. | runner-up: | #1 of 5 in Startup Banking by agent-ready | 76/100 · full arena |
| Online payments Charging customers — the deepest API surface in the stack (Stripe et al). | too close to call (Δ1.1) — either is a strong pick | top two of 10 in Online Payments by agent-ready | 89/100 · full arena |
| In-person payments Tap-to-pay and terminal fleets driven by API. | too close to call (Δ0.8) — either is a strong pick | top two of 4 in Mobile & In-Person Payments by agent-ready | 59/100 · full arena |
| Payroll Payroll previews, onboarding, and journal reconciliation by agent. | too close to call (Δ2.2) — either is a strong pick | top two of 4 in Payroll & HR Ops by agent-ready | 59/100 · full arena |
| Accounting The ledger agents close against — API depth decides everything here. | runner-up: | #1 of 11 in Accounting & Bookkeeping by agent-ready | 47/100 · full arena |
Regulated fintech stack
Battle this stack →Money movement with auditors in the room: banking, payments, ledger, and code security that survive a compliance review.
For: Fintech teams building under regulatory scrutiny — where every flow needs an audit trail and every repo needs scanning.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| Banking The operating account — statements, controls, and API access an auditor and an agent can both follow. | runner-up: | #1 of 5 in Startup Banking by agent-ready | 76/100 · full arena |
| Payments Card acceptance with the dispute, fraud, and reconciliation depth regulators expect. | too close to call (Δ1.1) — either is a strong pick | top two of 10 in Online Payments by agent-ready | 89/100 · full arena |
| Accounting The system of record — the ledger everything above must reconcile into, cleanly and programmatically. | runner-up: | #1 of 11 in Accounting & Bookkeeping by agent-ready | 47/100 · full arena |
| Code security Secret detection and dependency scanning in CI — table stakes before any fintech audit. | runner-up: | #1 of 6 in Security Scanners by agent-ready | 48/100 · full arena |
Indie hacker stack
Battle this stack →Ship a real product on a ramen budget: open source where it protects you, free tiers where it doesn't.
For: Solo builders shipping side projects that might become the main thing — minimal lock-in, minimal invoice.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| Backend Database, auth, and storage in one — open source so the backend can move to your own box when the bill matters. | runner-up: | #1 of 3 in Backend as a Service by agent-ready | 64/100 · full arena |
| Frontend framework The UI layer — pick the framework agents and docs serve best, not the one with the loudest fans. | too close to call (Δ2.7) — either is a strong pick | top two of 5 in Frontend Frameworks by PA Score | 37/100 · full arena |
| Hosting Deploy on the platform whose free/hobby path goes furthest before a card is required. | runner-up: | #1 of 6 in Edge & App Platforms by agent-ready | 79/100 · full arena |
| Analytics Know if anyone showed up — open source and self-hostable, so insight never becomes a subscription hostage. | runner-up: | #1 of 2 in Product Analytics by agent-ready | 56/100 · full arena |
Support & GTM stack
Battle this stack →Close the loop from lead to feedback: CRM, analytics, chat, and intent capture your agents can work end-to-end.
For: Founders and ops leads running go-to-market where agents enrich records, mine feedback, and route it to the team.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| CRM Contacts, companies, and pipeline — the record system agents enrich and advance via API/MCP. | runner-up: | #1 of 4 in CRM by agent-ready | 61/100 · full arena |
| Product analytics What users actually do — funnels and retention agents can query for the GTM story. | runner-up: | #1 of 4 in Product Analytics by agent-ready | 56/100 · full arena |
| Team chat Where the loop closes — bots post the signal into the room where humans decide. | runner-up: | #1 of 5 in Team Chat by agent-ready | 65/100 · full arena |
| Feedback & intent Capture what users ask for and turn it into prioritized, buildable work. | runner-up: | #1 of 3 in Product Feedback & Intent by agent-ready | 51/100 · full arena |
Incorporation-day stack
Battle this stack →The day-one founder set — bank, payroll, books, tracker, repo — the tool half of an ultrametric.ai/process incorporation checklist.
For: Founders standing up a company this week who want every day-one system agent-reachable from the start.
| Layer | Pick | Why this pick | Evidence? |
|---|---|---|---|
| Banking The first account the new entity opens — everything else pays out of or into it. | runner-up: | #1 of 5 in Startup Banking by agent-ready | 76/100 · full arena |
| Payroll Founder payroll and first hires — set up before the first paycheck is late, not after. | too close to call (Δ2.2) — either is a strong pick | top two of 4 in Payroll & HR Ops by agent-ready | 59/100 · full arena |
| Accounting Books from day one are cheap; books reconstructed at fundraise time are not. | runner-up: | #1 of 11 in Accounting & Bookkeeping by agent-ready | 47/100 · full arena |
| Project management The shared brain for what's next — where founders and agents file and triage the same work. | too close to call (Δ2.2) — either is a strong pick | top two of 6 in Project Management by agent-ready | 59/100 · full arena |
| Code hosting The company's first repo — PRs, CI, and issues agents can drive from commit zero. | runner-up: | #1 of 4 in Code Hosting by agent-ready | 71/100 · full arena |
Disagree with a pick? Every scored slot traces to an arena leaderboard — contest the underlying verdicts and the stack updates itself. See all rankings →