Audit software: 6 vendors compared

Audit software runs from the working papers firms have used for decades to AI platforms that draft the testing. Caseware is the installed base; DataSnipper became a unicorn by working inside Excel; Inflo and Fieldguide moved engagements to the cloud; Modus raised $85 million to rebuild audit practices inside firms it invests in; Quillon and Trullion cover technical accounting. Every vendor below has a full profile.

The vendors

Startups first, ordered by funding raised, then the established vendors they compete with

FieldguideStartup · $125m raisedAI platform for audit and advisory firms that runs engagements end to end, from request lists and evidence collection to testing and reporting, used by half of the 100 largest US CPA firms.→ModusStartup · $85m raisedAI-native audit technology company that invests in and partners with established accounting firms, giving them its platform while they keep their people, clients and brand.→QuillonStartup · $2m raisedAI workspace for technical accounting: researching standards, benchmarking SEC filings, reading contracts and drafting audit-ready memos where every claim traces back to the source paragraph.→CasewareAudit, financial reporting and analytics software used by more than half a million accountants in 130 countries, including most of the world's largest audit firms, now moving its working papers to the cloud with an AI assistant called AiDA.→DataSnipperExcel-based audit and finance automation from Amsterdam: document matching, extraction and cross-referencing inside the spreadsheet, used by all Big Four firms and valued at $1bn after a $100m Series B in 2024.→InfloCloud audit platform from Sunderland covering collaboration, data ingestion, analytics and workpapers, used by more than 1,000 firms in 120 countries and by a fifth of the 100 largest US firms.→

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Updated September 2026 · Part of Accountio’s accounting technology coverage