Tellen

Tellen is one of the few audit AI vendors that has resisted the temptation to become a general finance product, and it shows in both the integration list and the deployment model.

What it does well. The architecture is the selling point. Deploying into the firm's own cloud tenancy means client data never leaves the firm's control, which removes the objection that kills most audit AI pilots before they start. The SOC 2 Type 2 examination was performed by an independent CPA firm rather than self-attested, the integrations target the systems auditors actually live in (Caseware, Suralink, an Excel add-in), and the agents are scoped to discrete audit tasks rather than sold as an end-to-end replacement. Outcome-based pricing shifts some risk onto the vendor, which is unusual and welcome. A Grant Thornton partnership and two top-20 design firms are real validation.

Where it falls short. It remains a small company on modest funding, roughly USD 2.5 million disclosed, which is thin against the engineering demands of audit software and a live question for a firm signing a multi-year dependency. The ROI figures are Tellen's own and come from single engagements: the cited 332% return and near-300 hours saved at one firm are not a benchmark. Outcome-based pricing sounds attractive but is hard to scope without seeing the contract, and 'traceable outputs backed by verifiable sources' is the vendor's description, not an independently tested claim. Deploying into your own cloud also means your IT function inherits work that a SaaS vendor would otherwise carry.

Best for. Mid-sized to large audit practices with in-house IT capability, existing Caseware and Suralink workflows, and enough engagement volume to justify an outcome-based contract.

Verdict. Credible, well-targeted and built by people who have done the work, but small enough that vendor risk belongs in the evaluation.