Index.dev vs Folio3: full comparison for 2026
Quick verdict
Index.dev (4.2/5) edges ahead of Folio3 (3.9/5) overall. Index.dev is the better choice for startups that want a 30-day refundable trial before committing to a remote ML engineer. Folio3 is the stronger option for teams that need an MLOps or computer-vision engineer started within days on a low budget. The right choice depends on your project size, budget, and required tech stack.
Index.dev vs Folio3: head-to-head summary
| Criterion | Index.dev | Folio3 |
|---|---|---|
| Founded | 2019 | 2005 |
| HQ | London, United Kingdom | San Mateo area, California, USA |
| Team size | 30,000+ network | 500–1,000 |
| Rating | 4.2 / 5 | 3.9 / 5 |
| Primary differentiator | A 30-day trial with full refund on every placement | Very fast start times with a two-week trial and offshore pricing |
| Pricing model | Monthly rate per engineer; direct-hire fee option; 30-day trial with refund; rates on request | Monthly per engineer; two-week trial; offshore rates; rates on request |
| Min. engagement | Not published | Not published |
| Primary tech stack | Python, PyTorch, TensorFlow | Python, TensorFlow, PyTorch |
| Industries served | SaaS, Fintech, E-commerce, Healthcare, AI labs | Automotive, Agriculture, Retail, Healthcare, Fintech |
Index.dev vs Folio3: overview
Index.dev
Index.dev is a London company, founded in 2019 according to its own job ads, trading under the legal name Index Soft Limited. It calls itself an AI-first engineering talent platform. Its main network has more than 30,000 engineers in Latin America and Central and Eastern Europe, and a separate AI unit supplies Master's and PhD-level people for LLM fine-tuning and RAG work. Every engineer goes through five stages of vetting run by people, including a live screening call and technical validation, and Index.dev says about 1% are accepted. All placements come with a 30-day trial and a full refund if the match fails.
Folio3
Folio3 has been in software since 2005 and runs a dedicated AI brand from its California base, with delivery mostly in Pakistan and offices in several other countries. Speed is the pitch. Folio3 says it can put vetted AI engineers on a project within 24 to 48 hours, with a two-week trial, from a pool that covers ML, NLP, computer vision, LLM and agent specialists. One case study describes a full MLOps team supplied to a vehicle-data company. The company claims more than 700 employees, while directories give lower figures.
Services and capabilities: Index.dev vs Folio3
| Capability | Index.dev | Folio3 |
|---|---|---|
| ML engineers | ✓ | ✗ |
| LLM / GenAI engineers | ✓ | ✗ |
| AI agent developers | ✗ | ✓ |
| MLOps engineers | ✗ | ✓ |
| Computer vision engineers | ✗ | ✓ |
| NLP engineers | ✗ | ✓ |
| Data engineers | ✗ | ✗ |
| Engineer-led technical screen | ✗ | ✗ |
| Fractional / part-time experts | ✗ | ✗ |
| Trial before commitment | ✓ | ✓ |
| Nearshore time-zone overlap | ✓ | ✗ |
| Direct hire option | ✓ | ✗ |
Tech stack comparison: Index.dev vs Folio3
| Framework / platform | Index.dev | Folio3 |
|---|---|---|
| PyTorch | ✓ | ✓ |
| TensorFlow | ✓ | ✓ |
| LangChain | ✓ | ✓ |
| Hugging Face | ✓ | N/A |
| OpenAI | ✓ | N/A |
| AWS | ✓ | ✓ |
| Azure | N/A | ✓ |
| Google Cloud | ✓ | N/A |
| Databricks | N/A | N/A |
| Kubernetes | N/A | N/A |
Pricing comparison: Index.dev vs Folio3
| Criterion | Index.dev | Folio3 |
|---|---|---|
| Minimum engagement | Not published | Not published |
| Engagement models | Dedicated engineer, Dedicated team, Direct hire, Trial period | Dedicated engineer, Dedicated team, Trial period, Project delivery |
| Rate transparency | Not public | Not public |
| Price tier | Mid-market | Mid-market |
Target audience comparison: Index.dev vs Folio3
| Dimension | Index.dev | Folio3 |
|---|---|---|
| Best company size | Startup to mid-market | Mid-market to enterprise |
| Best industries | SaaS, Fintech, E-commerce | Automotive, Agriculture, Retail |
| Best use cases | Trialling a Latin American ML engineer for a month before committing, Hiring a PhD-level specialist to fine-tune an open-source LLM | Adding an MLOps team to a vehicle-data company, Bringing in a computer-vision engineer for crop monitoring |
| Typical project type | Dedicated engineer | Dedicated engineer |
Index.dev vs Folio3: pros and cons
| Index.dev | |
|---|---|
| + | The 30-day refundable trial is the most generous published trial on this page |
| + | A separate AI unit for advanced work such as fine-tuning |
| + | Clients can hire directly as well as contract |
| - | Vetting is human-led but not specifically run by ML engineers |
| - | Network figures and acceptance rates are company claims |
| - | Founding date only appears in job listings |
| Folio3 | |
|---|---|
| + | Fast start times and a two-week trial |
| + | Has supplied whole MLOps teams, not just single engineers |
| + | Lower rates thanks to delivery in Pakistan |
| - | Vetting method is not described in detail |
| - | Pakistan hours give little overlap with U.S. West Coast teams |
| - | Headcount claims differ widely between sources |
Who should choose Index.dev?
A typical fit: trialling a Latin American ML engineer for a month before committing.
A 30-day trial with full refund on every placement. Minimum engagement is not publicly disclosed. Works best with clients in SaaS, Fintech, E-commerce, Healthcare, AI labs.
Who should choose Folio3?
A typical fit: adding an MLOps team to a vehicle-data company.
Very fast start times with a two-week trial and offshore pricing. Minimum engagement is not publicly disclosed. Works best with clients in Automotive, Agriculture, Retail, Healthcare, Fintech.
Decision matrix: Index.dev vs Folio3
| Your situation | Recommended choice |
|---|---|
| You want a working engineer, not a recruiter, to run the technical screen | Neither documents an engineer-led screen; run your own technical interview |
| You need one specialist for a few days a week | Neither advertises part-time experts; ask about reduced hours |
| You need several engineers working as one team | Folio3 |
| You want to test an engineer before committing | Both; Index.dev rates higher overall |
| Your budget is at the lower end | Compare: Index.dev (Not published) vs Folio3 (Not published) |
| Your team works U.S. hours | Index.dev |
| You may want to hire the engineer permanently later | Index.dev |
Use case fit: Index.dev vs Folio3
| Use case | Index.dev fit | Folio3 fit | Winner |
|---|---|---|---|
| Trialling a Latin American ML engineer for a month before committing | Strong | Strong | Both equally |
| Hiring a PhD-level specialist to fine-tune an open-source LLM | Strong | Limited | Index.dev |
| Adding an MLOps team to a vehicle-data company | Limited | Strong | Folio3 |
| Bringing in a computer-vision engineer for crop monitoring | Limited | Strong | Folio3 |
Verdict: Index.dev vs Folio3
Index.dev (4.2/5) is the stronger overall choice for most AI Engineer Staffing projects. A 30-day trial with full refund on every placement.
Folio3 (3.9/5) is worth a look if you need bringing in a computer-vision engineer for crop monitoring. If your situation matches that, Folio3 is a competitive option.
Related comparisons
Index.dev vs Folio3 FAQ
Is Index.dev better than Folio3?
Index.dev (4.2/5) scores higher overall, but "better" depends on your use case. Index.dev's strongest advantage: the 30-day refundable trial is the most generous published trial on this page. Folio3's strongest advantage: fast start times and a two-week trial.
How do Index.dev and Folio3 differ in pricing?
Index.dev uses monthly rate per engineer; direct-hire fee option; 30-day trial with refund; rates on request pricing. Folio3 uses monthly per engineer; two-week trial; offshore rates; rates on request pricing. Neither firm publishes a full rate card; a discovery call is required for project-specific quotes.
Which is better for enterprise: Index.dev or Folio3?
Folio3 is the larger team and typically the better enterprise-scale choice. For very large programmes, verify team size and compliance coverage directly with each company before shortlisting.
What are the main differences between Index.dev and Folio3?
Index.dev's primary differentiator is: a 30-day trial with full refund on every placement. Folio3's primary differentiator is: very fast start times with a two-week trial and offshore pricing. They also differ in team size (30,000+ network vs 500–1,000), minimum engagement (Not published vs Not published), and primary industries served (SaaS, Fintech vs Automotive, Agriculture).
Verify all details directly with each company before making a decision.