Thai font \u00b7 OFL

Prompt

พร้อม

By Narongsak Chaiwong

Typography & Licensing Specialist, ThaiGraph · April 16, 2026

Information verified as of April 2026

What Prompt is

Prompt is a loopless geometric Thai sans-serif from Cadson Demak with rounder letterforms and a warmer tone than its sibling Kanit, shipping nine weights and matching italics under the SIL Open Font License. It covers Thai, Latin and Vietnamese and is distributed free through Google Fonts.

Cadson Demak designed Prompt alongside Kanit as part of a larger family of modern Thai sans-serifs published through Google Fonts in the mid-2010s. Where Kanit leans industrial and geometric-strict, Prompt softens the corners and opens up the counters, which gives it the same modernity without the corporate edge.

In commercial use, Prompt tends to show up on brands that want loopless modernity without looking like a bank. Cafes, boutique hotels, wellness brands and independent e-commerce shops in Thailand use it heavily, often as the sole typeface for both Thai and Latin.

Character design and tone

Prompt uses a high x-height, soft circular curves, and short stems relative to its cap height, producing a rounder silhouette than other Cadson Demak loopless faces. The head of ก is a gentle open hook that leans slightly inward, giving the letter a softer profile than Kanit’s more rigid opening.

Apertures on ถ, ภ and ร are open and wide, which keeps the face readable at small sizes despite the loopless construction. Stroke weight is essentially monolinear but gains subtle optical correction at joins. Thai tone marks and vowel signs are drawn at a consistent weight across the full range, so ไม้เอก above a Thin weight still reads at 10pt.

The Latin companion is a geometric sans with rounded terminals on s, c and e. Numerals are lining and full-height. Compared to Kanit’s Latin, Prompt’s Latin feels like a cousin of Poppins — same bone structure, softer finish.

Weights and availability

Prompt ships nine weights from Thin (100) to Black (900) with matching italics across all weights. The full family is on Google Fonts and on Cadson Demak. Each Thai + Latin subset weighs around 45-65KB per weight in WOFF2.

No italic-only or condensed cuts exist in the current release. For web deployments, a three-weight loadout (Regular, Medium, Bold) covers most UI needs at under 200KB total.

Best use cases

Prompt works hardest on consumer brands that want warmth and modernity in the same typeface. Strong fits include:

• Boutique hotel and hospitality branding — signage, collateral, web
• Wellness, spa and beauty brands where geometric-with-softness reads as premium
• Independent F&B packaging, particularly specialty coffee and craft beverage
• Creative agencies and design studios pitching themselves as contemporary
• Mobile-first Thai e-commerce where friendly UI type outperforms corporate sans

Where it doesn’t fit: government documents (use Sarabun), editorial long-form (serifs like Pridi or Taviraj read better), and high-contrast luxury where a display face earns more attention.

Pairings

Prompt pairs best with Latin sans-serifs that have similar soft geometric bones. Three strong pairings:

• Poppins — near-sibling geometric sans, ideal for Thai-English headline and subhead pairing
• DM Sans — slightly more neutral geometric that lets Prompt carry personality in the Thai
• Nunito — for heavily rounded brand systems that want softness across both scripts

Licensing

Prompt is released under the SIL Open Font License and is free for commercial use, modification, and bundling provided the original copyright and OFL licence are preserved. Verify at the Google Fonts page or the Cadson Demak specimen. No paid licence tier exists — the full family is free.

Information verified as of April 2026