Square is an American fintech company that grew from a tiny card reader for iPhone into an ecosystem of hardware, software, and banking services. Today, Square serves millions of small businesses from coffee shops to online stores, offering everything from terminals to lending and checking accounts.

The Square Ecosystem

Square is not just a payment gateway. It’s a full operating system for business:

Offline payments: proprietary POS terminals (Square Reader, Square Terminal, Square Register) accept cards, Apple Pay, Google Pay. Fixed-rate commission with no hidden fees.

Gumroad is a pioneer of the Merchant of Record model for content creators. You upload a digital product, set a price — everything else (payment processing, taxes, VAT, refunds, file delivery) is handled by the platform. No business registration or payment gateway integrations needed.

How Gumroad Works

The model couldn’t be simpler: create a product page, upload files, set a price. Gumroad processes payments, calculates and pays taxes (including VAT for EU), delivers the product to the buyer, and handles refunds. You receive payouts to your bank account or PayPal.

Descript is a unique tool that changes the paradigm of editing. Instead of a timeline with tracks, you edit text — and video and audio change along with it. Cut a word from the transcript, and it disappears from the video. Add a paragraph, and AI voices it in your voice.

How It Works

Descript transcribes video or audio into text with about 95% accuracy. Then you work as if in Google Docs: remove filler words, rearrange fragments, fix errors. The video edits automatically.

Everyone needs a professional portrait: LinkedIn, company website, presentations, conferences. But a photoshoot costs time, money, and inconvenience. HeadshotPro solves this problem radically: you upload selfies from your phone, and AI transforms them into studio-quality portraits at the level of a corporate photographer.

How the Service Works

The process is ridiculously simple:

1. Upload 10–15 selfies with different angles and lighting
2. Choose a clothing style (business, casual) and background
3. AI trains on your photos and generates 40+ portraits
4. Download the ones you like in high resolution

Generation takes 2–3 hours — longer than competitors, but the quality justifies the wait. HeadshotPro’s model is one of the few that correctly conveys facial features without the “stranger in your body” effect.

Leonardo AI stands out among image generators with its clear specialization in game graphics, concept art, and development assets. If Midjourney is a universal artist, Leonardo is a specialized tool for game designers, 3D artists, and visual world creators.

What is Leonardo AI

Leonardo AI is an image generation platform with a web interface, originally oriented toward the gaming industry. The service offers dozens of pre-trained models, each tuned for a specific style: from pixel art to hyper-realistic characters.

Midjourney is one of the most impressive AI tools for image generation. Launched in 2022 as a research project, it quickly became the main competitor to DALL·E and Stable Diffusion, earning recognition from professional designers, illustrators, and marketers.

How Midjourney Works

Unlike most competitors, Midjourney doesn’t have a web interface in the traditional sense. Image generation happens through a Discord bot — which sounds unusual, but in practice works lightning-fast.

Copy.ai is one of the earliest AI copywriters that outgrew the “headline generator” format and evolved into a full-fledged text platform. Launched in 2020, it has gone from a simple GPT-wrapper to a GTM (Go-To-Market) platform with workflow automation.

Website: copy.ai

What Copy.ai Can Do

Unlike chat interfaces like ChatGPT, Copy.ai offers structured workflows:

• Brand Voice — the service remembers your brand’s tone and style so all content speaks in one voice
• Workflows — action chains: research → generation → editing → publishing
• Infobase — a company knowledge base that the AI uses for fact-checking
• Chat — classic AI chat with brand context
• Templates — 90+ preset formats: from email campaigns to LinkedIn posts and SEO descriptions

Who It’s For

The primary audience is marketing teams and GTM specialists. Copy.ai is built for sales and marketing content: landing pages, email sequences, social media posts, product descriptions. It’s less suited for technical documentation or academic writing.

Chargebee: SaaS Billing Automation

Chargebee is a subscription management and billing platform built for SaaS companies. The service handles all the complexity of recurring payments: trials, upgrades, downgrades, coupons, taxes, invoices, and dunning management.

Official website: chargebee.com

What Chargebee Does

Subscription Management:

• Any pricing model: flat-rate, usage-based, tiered, volume-based
• Trials (with and without card), freemium conversion
• Upsells, cross-sells, add-ons
• Subscription pausing and resuming
• Plans with any billing cycle (daily, weekly, monthly, yearly)

Billing & Payments:

Revolut: Banking Without Borders

Revolut is a British digital bank that has evolved from a simple currency exchange app into a full-fledged financial platform. Today Revolut offers current accounts, loans, investments, crypto trading, and insurance — all in one app.

Official website: revolut.com

Revolut Features

Multi-Currency Accounts:

• 30+ currencies in one account
• Interbank exchange rates with no markup on weekdays (up to a limit)
• Local banking details for GBP and EUR (IBAN)

Payments & Transfers:

Wise: Honest International Transfers

Wise (formerly TransferWise) is a financial service that has fundamentally changed the international transfer market. Instead of hidden bank markups on exchange rates, Wise uses the real mid-market rate and charges a small, transparent fee.

Official website: wise.com

How Wise Works

Unlike banks that send money through the SWIFT system (with a chain of intermediaries), Wise uses local accounts in each country. The money doesn’t actually cross borders: