Micro SaaS is the side hustle that fights clean and wins on leverage. One focused feature, one narrow audience, recurring revenue. If you have basic coding or low code skills and a nose for business pain, you can carve out a niche that pays every month. This guide breaks down the best micro SaaS ideas, how each one works, who it is good for, startup cost, risks, and what you can realistically earn. Think small market, sharp execution, repeatable moves.
How micro SaaS works is simple. You solve a painful, boring problem for a very specific group and charge a monthly subscription. Keep the app simple, hosted, and fast. Use a lean stack, a clean landing page, and outreach to get your first customers. Typical startup cost is 50 to 300 dollars for domain, hosting, and tools. Time to first dollar can be two to six weeks if you validate with paid pilots. Your aim is not buzz. Your aim is predictable income and low churn. Master the basics and move with precision.
1. CPA deadline tracker for small firms: How it works: a web app that tracks filings by client, sends automated reminders, and creates a daily action list for the team, plus calendar and email sync. Best for: makers who know accounting workflows or operators with tax season scars. Startup cost: about 100 to 250 dollars. Time to first dollar: two to four weeks with a pilot to two to five local firms. Risks: seasonality and data sensitivity, so keep access control tight. Earning potential: charge 49 to 149 dollars per firm per month. With twenty firms that is 980 to 2,980 dollars MRR after a few months of outreach.
2. HOA violation photo logger for property managers: How it works: mobile friendly site to snap a photo, auto tag location, select rule, and generate a mailed or emailed notice with a clean PDF log. Best for: builders who can visit local managers and demo on the spot. Startup cost: around 150 dollars including document and mapping services. Time to first dollar: three to six weeks with a paid pilot to one management company. Risks: compliance rules vary by state and you must store photos securely. Earning potential: price at 99 to 299 dollars per HOA per month or one to two dollars per door. Ten HOAs can bring 1,000 to 3,000 dollars MRR.
3. Vendor compliance portal for Amazon and retail brands: How it works: track insurance certificates, safety docs, and supplier agreements in one portal with automated expiry reminders and simple requests to vendors. Best for: people who know eCommerce ops or have worked in supply chain. Startup cost: 100 to 200 dollars. Time to first dollar: two to five weeks by pitching brands on LinkedIn and in seller groups. Risks: selling into busy operators and making onboarding painless. Earning potential: 39 to 99 dollars per brand per month. Fifty brands can yield 1,950 to 4,950 dollars MRR.
4. Gym class waitlist optimizer for boutique studios: How it works: watch class rosters, ping people when a spot opens, and backfill automatically with smart timing so classes stay packed. Includes text or email and a lightweight dashboard. Best for: fitness fans with basic dev chops who can talk to studio owners. Startup cost: 100 to 200 dollars. Time to first dollar: three to six weeks with a free trial that converts on saved classes. Risks: integrations and terms of service, so offer a manual CSV mode too. Earning potential: 79 to 199 dollars per location per month. Fifteen studios bring 1,185 to 2,985 dollars MRR.
5. Restaurant allergy and ingredient menu manager: How it works: a simple back office to manage ingredients, auto build an allergen matrix, and publish a QR menu that updates in real time with clear labels. Best for: food service pros or anyone who can walk into restaurants and demo on a tablet. Startup cost: about 100 dollars. Time to first dollar: two to four weeks by offering a setup session and printing the QR code sticker. Risks: data upkeep and staff adoption, so keep it dead simple. Earning potential: 29 to 99 dollars per restaurant per month. Forty restaurants can reach 1,160 to 3,960 dollars MRR.
6. Podcast guest scheduler and lightweight CRM: How it works: one intake form for pitches, automatic tagging, calendar booking, prep notes, and a simple pipeline view of episodes. Best for: creators who know the podcast grind and can sell in communities. Startup cost: 50 to 150 dollars. Time to first dollar: one to three weeks by onboarding two to five shows directly. Risks: crowded tools market, so focus on indie shows and the one job to be done. Earning potential: 19 to 49 dollars per show per month. One hundred shows can yield 1,900 to 4,900 dollars MRR.
7. Construction daily log and photo collector for subcontractors: How it works: foremen capture photos, notes, crew hours, and materials from the site, auto timestamped with weather, then export clean PDFs for the GC. Best for: makers who can visit yards and job sites and speak plainly. Startup cost: 150 to 300 dollars. Time to first dollar: three to six weeks with a paid pilot on one active project. Risks: spotty connectivity and change resistant crews, so make offline capture and one tap actions. Earning potential: 79 to 149 dollars per crew per month. Twenty crews can bring 1,580 to 2,980 dollars MRR.
Your path to launch is straightforward. Pick one niche you can reach, write a clear value promise in a single sentence, put up a landing page with a real price, and book discovery calls. Offer a short paid pilot, build the smallest useful version, and ship. Aim for your first five paying accounts, then refine. The discipline is the art. Keep the surface area small, the value obvious, and the outreach steady. Save this list, choose your target, and step onto the mat.