Invoice Maker vs Blindspot AI Devil's Advocate
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Invoice Maker
Create professional invoices and estimates quickly with customizable templates and branding options. This app is designed for freelancers and small businesses to streamline billing and get paid faster, offering offline functionality and PDF export.
- Create unlimited invoices and estimates
- Customizable invoice templates
- Add logos and business branding
- Export and share as PDF
- Duplicate invoices for quick edits
- Works offline
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Send a professional quote, win the job, then turn it into an invoice in one tap — all as polished PDFs, without accounting software. Invoice Maker is built for freelancers, contractors, consultants and small businesses who need to quote, bill and get paid. Create estimates and invoices, preview the PDF, and send it by email, Messages or WhatsApp, or print it. HOW IT WORKS 1. Add your business details and logo once 2. Create an estimate or invoice — tax, discounts and totals calculate automatically 3. Preview the PDF exactly as your client will see it 4. When your client says yes, convert the estimate to an invoice in one tap 5. Send it, then mark it paid when the money arrives ESTIMATES & QUOTES • Title your PDFs "Estimate" or "Quote", set per business • Set how long your prices are valid; expired estimates are flagged so you know who to follow up • Mark estimates sent, accepted or declined • Convert to an invoice with every item carried over and the next invoice number INVOICES • Clean, professional templates with your logo and signature • Tax (inclusive or exclusive), discounts and your currency • Your payment details printed on every invoice • Saved clients and items, so repeat work takes seconds • See what's paid, outstanding, overdue and due soon MORE • Run more than one business, each with its own numbering, currency and template • Home Screen widgets and Shortcuts IPHONE, IPAD AND MAC A native app on each device, kept in sync through your own iCloud account. Start a quote on your phone and finish it on your Mac. NO ACCOUNT No sign-up or login. Your estimates and invoices stay on your devices and in your iCloud. FOCUSED ON QUOTING AND INVOICING Invoice Maker isn't bookkeeping software — no ledgers, bank feeds or payroll. PRICING Free to download: set up your business, add clients and items, and create and preview estimates and invoices. Sending, sharing and exporting PDFs requires Invoice Maker Pro — monthly, yearly (with a free trial for eligible new subscribers), or a one-time lifetime purchase. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Blindspot AI Devil's Advocate
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Every massive success starts with a bulletproof idea. Blindspot is your personal, hyper-intelligent board of directors, designed to find the fatal flaws in your logic before the real market does. Speak your business plan, app concept, or strategic decision directly into the app. Blindspot’s advanced AI logic core immediately processes your concept and pushes back with realistic, challenging, and highly analytical dialogue through distinct, voice-acted personas. THE PERSONAS: • The Ruthless Investor: Tears apart your financial logic, margins, and market fit. • The Skeptical Consumer: Highlights user friction, onboarding drop-offs, and trust issues. • The Ethical Hacker: Finds the technical vulnerabilities, privacy risks, and logical paradoxes in your execution. CORE FEATURES: • Real-time voice interaction with ultra-realistic AI personalities. • Deep analytical logic that identifies blind spots, biases, and market gaps. • A premium, ad-free "liquid glass" interface designed for pure focus. • Complete privacy: Your ideas stay on your device and are strictly used for transient analysis. Don't surround yourself with yes-men. Get the harsh truth. Get Blindspot. ==================================== SUBSCRIPTION & AUTO-RENEWAL POLICY ==================================== Blindspot offers a premium "Blindspot Pro" subscription that unlocks full access to all elite AI personas and unlimited deep logic analysis. • Payment will be charged to your Apple ID account at the confirmation of purchase. • The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current billing period. • Your account will be charged for renewal within 24 hours prior to the end of the current period at the active subscription price. • You can manage your subscriptions and turn off auto-renewal by going to your App Store Account Settings after purchase. • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. • All premium features are unlocked immediately upon successful subscription confirmation via Apple StoreKit. LEGAL & SUPPORT LINKS Support: https://docs.google.com/document/d/1CLVrCKJ9hin8bKp7STxBV_HPYCY4Ghz2iL0ikZfXNY4/edit?usp=sharing Terms of Service: https://docs.google.com/document/d/1CLVrCKJ9hin8bKp7STxBV_HPYCY4Ghz2iL0ikZfXNY4/edit?usp=sharing Privacy Policy: https://docs.google.com/document/d/1mpfgdpTu0_xv_MSSSPh8yXqk7qoMOBbW-iSn_GBMFOM/edit?usp=sharing Contact: support@sumhead.com
Screenshots
Verdict
The clearest difference is update cadence: Invoice Maker at every 9 days against Blindspot AI Devil's Advocate's every 3 weeks. Invoice Maker also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Invoice Maker sells 3 in-app purchases, starting at $5.99 per month and Blindspot AI Devil's Advocate sells 2 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.
Invoice Maker ships an update every 9 days, Blindspot AI Devil's Advocate every 3 weeks. The most recent releases landed on October 7, 2026 and October 17, 2026 respectively.
| Parameter | Invoice Maker | Blindspot AI Devil's Advocate |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (15 ratings) — better | — |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | 15 — better | — |
| Update frequency | Every 9 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Mac — better | iPhone |
| Requires iOS | 18.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 28 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Collins Cheruiyot | NICHOLAS ERWIN HEITKAMP |
In-app purchases
Invoice Maker
- Unlimited access for 1 month3 Days trial$5.991 Month
- Unlimited access for 1 year3 Days trial$29.991 Year
- Unlimited access forever$89.99
Blindspot AI Devil's Advocate
- Blindspot Pro1 Month trial$14.991 Month
- 3 Premium Pitches$2.99
Questions
Is Invoice Maker free?
Is Blindspot AI Devil's Advocate free?
Do Invoice Maker or Blindspot AI Devil's Advocate have ads?
Which is updated more often, Invoice Maker or Blindspot AI Devil's Advocate?
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