--- title: "Learn - Page 13 | Dupple" url: "https://dupple.com/learn/13" description: "Practical AI guides, tutorials, and how-to articles. Learn to use ChatGPT, Perplexity AI, and other AI tools effectively for work and business." llms_txt: "https://dupple.com/llms.txt" --- Learn # AI guides & tutorials Practical, tested guides to help you pick and use AI tools at work. Prices checked on each vendor's own page. Search all guides 1015 guides Last published Nov 2026 ## Guides, page 13 Page 13 of 34 Blog Post Aug 29, 2026 ## Best Free Scheduling Apps in 2026 The best free scheduling apps in 2026. Cal.com's free plan allows unlimited event types, Calendly's allows one. What each free tier really gives you. Blog Post Aug 27, 2026 ## Best Free Email Marketing Tools in 2026 The best free email marketing tools in 2026. Kit is free up to 10,000 subscribers, Brevo caps sends at 300 a day and Mailchimp stops at 250 contacts. Blog Post Aug 26, 2026 ## Best Shift Scheduling Apps in 2026 The best shift scheduling apps in 2026, compared on real pricing. Connecteam charges $29 a month for 30 users, Deputy $5 each. Same team, five times the bill. Blog Post Aug 25, 2026 ## Best Free Accounting Software in 2026 The best free accounting software in 2026, with verified prices and aggregated ratings across 26,000 reviews. Wave and Zoho Books are genuinely free, QuickBooks starts at $38, and free has a hard ceiling here. Blog Post Aug 25, 2026 ## Best Free AI Agents in 2026 The best free AI agents in 2026, with real free-tier limits: n8n rates 4.7, CrewAI gives 50 executions a month, and credit pricing is harder to budget than it looks. Blog Post Aug 25, 2026 ## Best Free AI App Development Platforms in 2026 The best free AI app development platforms in 2026, with verified prices and aggregated ratings. Botpress rates 4.5 across 509 reviews, Dify is open source, and the paid ladders run to $750. Blog Post Aug 25, 2026 ## Best Free AI Code Review Tools in 2026 The best free AI code review tools in 2026, with aggregated ratings and verified prices. CodeRabbit is free on open source, Sourcery rates 4.8, and free means something different in every one of them. Blog Post Aug 25, 2026 ## Best Free AI Debugging Tools in 2026 The best free AI debugging tools in 2026, with exact free-tier quotas and verified prices. Sentry gives 5,000 errors a month, Honeycomb gives 20 million events, and the difference explains everything. Blog Post Aug 25, 2026 ## Best Free AI Tools for DevOps in 2026 The best free AI tools for DevOps in 2026, with verified prices and honest ratings. k8sGPT is free and open source, Cursor rates 4.7, and most of this category has no review data at all. Blog Post Aug 25, 2026 ## Best Free AI Expense Management Tools in 2026 The best free AI expense management tools in 2026, with verified prices and the largest review samples of any category we cover. Navan rates 4.7 across 9,226 reviews, and free here means something specific. Blog Post Aug 25, 2026 ## Best Free AI Research Assistants in 2026 The best free AI research assistants in 2026, with verified prices and aggregated ratings. Consensus rates 4.8 across 1,869 reviews, NotebookLM is free, and one rating in this category belongs to the wrong company. Blog Post Aug 25, 2026 ## Best Free AI Tools for Founders in 2026 The best free AI tools for founders in 2026, with verified prices and aggregated ratings. Cursor rates 4.7, Gamma rates 2.8 across 133 reviews, and the gap between them is the most useful thing here. Blog Post Aug 25, 2026 ## Best Free Corporate Cards in 2026 The best free corporate cards in 2026, with verified prices and 4,072 aggregated reviews. Ramp and Brex both rate 4.7, the software is free because of interchange, and that is the fact that decides the choice. Blog Post Aug 25, 2026 ## Best Free Documentation Tools in 2026 The best free documentation tools in 2026, with verified prices and ratings. Confluence, GitBook, Scribe and Notion compared, plus why Notion's 3.5 misleads. Blog Post Aug 25, 2026 ## Best Free GraphQL Tools in 2026 The best free GraphQL tools in 2026, with verified prices and honest ratings. Postman and Insomnia for clients, Hasura for instant APIs, Yoga for servers, and why one rating in this category is a trap. Blog Post Aug 25, 2026 ## Best Free Help Desk Software in 2026 The best free help desk software in 2026, checked on vendor pricing pages. Zoho Desk, Help Scout, HubSpot and Jira compared on what their free plans cap. Blog Post Aug 25, 2026 ## Best Free Invoicing Software in 2026 The best free invoicing software in 2026, with verified prices and aggregated ratings. Zoho Books, Harvest, Paymo and Bookipi compared, and why we threw out several published prices. Blog Post Aug 25, 2026 ## Best Free Loyalty Program Software in 2026 The best free loyalty program software in 2026, with verified prices and 1,684 aggregated reviews. Smile.io rates 4.8, free tiers are capped by monthly orders, and the cap is what you are really choosing. Blog Post Aug 25, 2026 ## Best Free Marketing Automation Tools in 2026 The best free marketing automation tools in 2026, backed by 115,000 aggregated reviews and verified prices. Why Mailchimp and HubSpot both rate 3.9, and why both numbers are misleading. Blog Post Aug 25, 2026 ## Best Free Network Security Monitoring Tools in 2026 The best free network security monitoring tools in 2026, with aggregated ratings and honest limits. Zabbix rates 4.5, Auvik has no free tier at all, and free here means you supply the operator. Blog Post Aug 25, 2026 ## Best Free Newsletter Growth Tools in 2026 The best free newsletter growth tools in 2026, with verified prices and benchmark data from the 950,000 subscribers of our six newsletters. Blog Post Aug 25, 2026 ## Best Free Project Management Software in 2026 The best free project management software in 2026, backed by 148,000 aggregated reviews and verified prices. Asana, Trello, ClickUp, Jira and Wrike compared on what their free plans actually cap. Blog Post Aug 25, 2026 ## Best Free Sales Intelligence Software in 2026 The best free sales intelligence tools in 2026, with verified prices and 12,798 aggregated reviews. Apollo.io rates 4.7, free tiers are measured in credits, and the credit is the product. Blog Post Aug 25, 2026 ## Best Free Screen Recording Software in 2026 The best free screen recording software in 2026, with verified prices and ratings. OBS Studio is free with no limits, Loom rates 4.7, and Zight starts at $9.95. Blog Post Aug 25, 2026 ## Best Free Serverless Platforms in 2026 The best free serverless platforms in 2026, with verified prices and aggregated ratings. Cloudflare Workers starts at $5, Vercel at $20 and Render at $25, and the free tier is not where the cost lives. Blog Post Aug 25, 2026 ## Best Free Stock Screeners in 2026 The best free stock screeners in 2026, with verified prices and aggregated ratings. Koyfin rates 4.8, Zacks rates 2.7 across 168 reviews, and this is the widest rating spread in any category we cover. Blog Post Aug 25, 2026 ## Best Free Task Management Apps in 2026 The best free task management apps in 2026, backed by 140,000 aggregated reviews and verified prices. Todoist rates 4.6, Google Calendar 4.8, and the free plan you should pick depends on one question. Blog Post Aug 25, 2026 ## Best Free Team Chat Apps in 2026 The best free team chat and communication apps in 2026, backed by 130,000 aggregated reviews and verified prices. Slack rates 4.2 on 62,554 reviews, and the free plan limit is the thing to understand. Blog Post Aug 25, 2026 ## Best Free Video Editing Software in 2026 The best free video editing software in 2026, with verified prices and aggregated ratings. Canva Video rates 4.7 across 20,192 reviews, Blender is free forever, and two ratings here are broken. Blog Post Aug 25, 2026 ## Best Social Media Scheduling Tools in 2026 Social media scheduling tools compared on real 2026 pricing: Buffer at $5 per channel, Hootsuite $99 per user, Sprout Social from $79 a seat, and who each suits.