Reliabl
Techstars '24San Francisco, US · Founded 2019 · 21 employees on LinkedIn · 2 known investors
Find your way into Reliabl
Reliabl provides a data annotation platform for training machine learning models and evaluating AI systems, using custom taxonomies and collaborative review tools to handle complex, nuanced data with attention to cultural context and bias mitigation.
Also known as Reliabl.ai
Founders & leadership
Investors · 2
How we know: the Techstars portfolio · open dataset · Top 3000 Accelerator Startups (no YC) 2026-08 · Not right? Tell us
How we know: a partner's Signal profile · Not right? Tell us
Company profile
researched Sep 2026Reliabl operates a collaborative data annotation platform used to produce machine learning training data and human evaluation datasets. The workflow spans data collection, definition of custom ontologies, semantic frameworks and taxonomies, annotation by invited teams, reviewer and consensus workflows, and export of structured training-ready datasets from within the platform. The product is positioned for teams whose data requires context-specific labels rather than generic categories, and the company states that legacy annotation tools miss cultural nuance and subjective interpretation.
The platform emphasizes multi-participant labeling: customers can invite internal team members, domain experts, reviewers, community members and their own users to annotate the same project, discuss contested labels, and reach decisions with label-consensus visibility and inter-annotator agreement built in. Reliabl also offers hands-on services alongside the software, including facilitating feedback sessions with customers' domain experts, sourcing experts and community annotators, and support for subsequent model training or evaluation work. The company describes itself as a social impact company and states that no technical expertise is required to use the tool.
Business model
Software platform sold to organizations building AI systems, supplemented by services such as taxonomy co-design facilitation, sourcing of expert and community annotators, and support for model training and evaluation. Access is currently granted through a rolling early-access onboarding process, with prospects submitting a form or booking a demo with the founder.
Traction
The website lists press and recognition items including a feature in Mashable, an appearance on Fast Company's Creative Control podcast, and an impact investment from New Media Ventures. Reliabl was one of 12 companies selected for the inaugural Techstars San Francisco accelerator class announced in September 2024.
Latest developments
Reliabl is onboarding new users to its platform on a rolling early-access basis, offering founder-led demos, and has expanded its positioning to cover both ML training data and human AI evaluation datasets.
▸Full profile — market position, technology, go-to-market, geography, risks & controversies
Market position
Positioned in the data annotation and AI evaluation tooling market as a human-centred, social-impact alternative to established labeling platforms, focused on bias mitigation, cultural context and data worker welfare.
Reliabl positions itself against traditional annotation platforms by capturing cultural nuance and subjective interpretation rather than generic labels, using diverse annotator pools and structured discussion to surface and correct bias. The company states it is the only data annotation service endorsed by Techworker Community Africa and Princeton's Workers' Algorithmic Observatory, organizations focused on data worker rights and exploitative practices in the AI industry, and it commits to fair compensation, clear guidelines and ethical treatment of annotators.
Technology
A web-based annotation tool supporting custom, context-specific labels; user-built or uploaded ontologies and taxonomies; multi-annotator projects with discussion threads on label choices; inter-annotator agreement and label-consensus tracking; reviewer workflows; and in-platform export of structured ML training and AI evaluation datasets. The company describes the system as integrated and research-backed.
Go-to-market
Direct, founder-led sales motion via a website request-for-access form and founder demos, with prospects onboarded on a rolling basis and a stated follow-up within two business days. Visibility has also come from accelerator participation and press features.
Organizations training or evaluating AI and machine learning systems, including founders and directors, product managers, AI/ML engineers, researchers, trust and safety teams, community managers and data annotators, particularly those working with complex, subjective or culturally specific data.
Geography
Listed as San Diego, California in the Techstars San Francisco Fall 2024 cohort announcement; endorsements referenced include Techworker Community Africa and Princeton University's Workers' Algorithmic Observatory.
Risks & controversies
The company handles sensitive personal data uploaded by customers, which its privacy notice says can include identifiers, financial data and biometric identifiers such as fingerprints, facial features, iris patterns, video and voiceprints. Reliabl states it may use customer materials and personal data, with consent, for internal product development and model training using de-identified or aggregated data, revocable in writing, and may facilitate data licensing to vetted third parties in exchange for rewards, credits or compensation. Personal data may also be transferred in a merger, acquisition, financing due diligence or asset sale.
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Timeline · 2
launches, deals, and filingsReliabl (listed as San Diego, CA) was named one of 12 startups in the Fall Class of 2024 of the Techstars San Francisco accelerator, a 13-week program with a Demo Day scheduled for December 5.
Reliabl's website lists a featured item stating the company secured an impact investment from New Media Ventures. No amount or date is stated.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
▸Research sources · 8
primary sources listed
- Reliablreliabl.ai · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Reliabl do?
- Reliabl is a collaborative data annotation platform for building culturally contextual AI training and evaluation datasets.
- Who are Reliabl's investors?
- Reliabl's investors include Techstars, Ad Astra Ventures.
- Where is Reliabl headquartered?
- Reliabl is headquartered in San Francisco, US.



