Top 20 open-source fonts (and pairings) for SaaS products

Arta Citko
Oct 7
4 min read

Updated: Oct 8

Fonts can make your product feel slick and trustworthy… or amateur and inconsistent.

So instead of throwing random Google Fonts at your interface, let’s make this easy: here are 20 open-source fonts for SaaS products — and 20 ready-made pairings — that’ll make your SaaS product and website look clean, professional, and cohesive.

🧠 First, what makes a great SaaS font?

In a SaaS world, your fonts need to:

Look good on screens (small, large, retina, mobile).
Stay readable in product UIs and dashboards.
Feel professional and modern, not gimmicky.
Be free and open-source, so you’re not stuck with licensing headaches later.

🎯 Top 20 Open-Source Fonts for SaaS & UI

Mostly sans-serif (clean & modern), many variable families (super flexible), great readability, and solid language support:

Inter – Made for screens. Tall x-height, works tiny sizes, perfect for product UIs.
Roboto – Friendly, modern, neutral. Works everywhere: apps, websites, dashboards.
Open Sans – Clean, simple, legible. Perfect for body text.
Lato – A bit more personality with round shapes, still clean. Good for UI and marketing.
Nunito / Nunito Sans – Rounded, approachable. Softer than harsh geometry.
Montserrat – Geometric, bold when you need it. Great for headings or marketing.
Source Sans Pro – Adobe-designed for UI & text. Very readable, lots of weights.
Fira Sans – Super versatile, many styles. Works well on any screen.
Atkinson Hyperlegible – Accessible AF. Letters are super distinct.
Public Sans – Neutral, clean, works across industries. Based on classic Libre Franklin.
DM Sans – Geometric, low contrast. Small UI elements look sharp, clear, calm.
Satoshi – Modern, sharp, bold. Adds character without stealing focus.
Mona Sans – Grotesque-inspired, multiple styles. Perfect for pairing.
Switzer – Tall letters, high x-height. Readability champ, especially in dense layouts.
Space Grotesk – Modern, a bit quirky. Works for headings or playful UIs.
Work Sans – Clean, screen-optimized. Great for headings and body text.
Rubik – Rounded, friendly. Use in headlines or small UI elements.
B612 – Technical / instrument-style. Clean, humanist, works in precise layouts.
Zilla Slab – Slab serif. Adds weight & contrast for titles or branding, still open-source.
Cascadia Code – Monospaced hero. Perfect for code, logs, dashboards, dev tools.

You can use one typeface and utilize its many font weights - bold for headlines, regular for body texts. Or you can use one main typeface and choose a different one for the H1 or H0 headlines, to add some more personality to your brand. There are pros and cons of choosing one vs multiple fonts.

🩶 10 Neutral, Safe, “You-Can’t-Mess-It-Up” Pairings

These are your safe bets. They’re modern, balanced, and make your brand look like it knows what it’s doing — even if you just installed your first Figma plugin yesterday.

Heading Font	Body/UI Font	Why It Works
Inter Bold	Inter Regular	Same family = instant consistency. Clean, legible, modern.
Roboto	Open Sans	Familiar and stable. Works everywhere, from dashboards to decks.
Lato Bold	Lato Regular	Soft edges = human touch. Feels friendly but still polished.
Source Sans Pro Semibold	Source Sans Pro Regular	Designed for UI. Looks clean and efficient.
DM Sans Bold	DM Sans Regular	Minimal, elegant, no-nonsense — perfect for modern SaaS.
Public Sans Bold	Public Sans Regular	Feels reliable and institutional — good for B2B and fintech.
Work Sans Semibold	Work Sans Regular	Built for digital interfaces. Super readable.
Fira Sans Medium	Fira Sans Regular	Great all-rounder. Works well in dense text or product menus.
Nunito Sans Bold	Nunito Sans Regular	Rounded and approachable — perfect for friendly brands.
Mona Sans Semibold	Inter Regular	Slightly more character up top; Inter keeps things grounded.

💥 10 Font Pairings with More Personality

Now, if you want your brand to have a bit more flair — something that feels less “default UI” and more “designed on purpose” — these combos add just enough spice without breaking usability.

Heading Font	Body/UI Font	Why It Works
Montserrat	Inter	Montserrat = bold personality; Inter = practical sidekick.
Satoshi	DM Sans	Confident and slightly futuristic. Great for tech-driven brands.
Space Grotesk	Work Sans	Playful yet professional. Adds character to plain UIs.
Rubik	Open Sans	Rounded friendliness that feels human and warm.
Switzer	Inter	Sharp, modern, slightly edgy — ideal for startups with attitude.
Zilla Slab	Lato	A dash of editorial energy for headings, clean sans for body.
Atkinson Hyperlegible	DM Sans	Accessibility-first, modern second. Looks great everywhere.
B612	Public Sans	Tech-forward and trustworthy. Feels made for dashboards.
Mona Sans	Satoshi	Both contemporary; Mona’s structure + Satoshi’s polish = 🔥
Poppins	Inter	Poppins brings geometric charm, Inter keeps it usable.

✅ Use these if: you want your SaaS brand to feel distinct, confident, or a little playful — but still professional.

Quick Font Rules for Non-Designers

👉 Two fonts max. One for headings, one for everything else.

👉 Use weights, not extra fonts. Need hierarchy? Bold it.

👉 Set clear rules. Decide which font goes where, once — and stick to it.

👉 Test it on screens. Fonts look different in Figma vs. real browsers.

👉 Check your language support. Especially if you’re using accented characters (Latvian, I see you 👀).

To summarize:

When it comes to SaaS typography, it’s not about how many fonts you use — it’s how consistently you use them. One clear, cohesive system beats ten “cool” fonts every time.
So pick your pairing, set your rules, and stick to them. Your product will look cleaner, your marketing will feel sharper, and your brand will finally look like it’s all speaking the same language.

💡 Bookmark this list and share it with your team — your future self (and your brand designer) will thank you.

💡 What to read next? Should your SaaS product and marketing use the same font? Read about pros, cons, and best practices + check out at some examples.

And remember - a short consultation with a designer (actual human) is always a good idea, if you don’t have one in your team. AI is good for ideas, but before launching your design to other humans, better check in with a human. You can always ask me! ;) Book a consultation