Best of · AI Writing for Agencies

The best AI writing software for agencies

An agency tool has to hold many client brands apart while producing at volume on margin. We weighted multi brand management, SEO depth and scale, then ranked the five that earn their seat across a client roster.

Reviewed by M. HALLORAN·Updated JUNE 2026·How we vet
Tools compared 5
Criteria weighted 5
Last reviewed June 2026
Paid placements 0
How we ranked the field

For agencies we weighted multi brand management and SEO depth: keeping client voices separate while producing search content at a margin. See the full rubric →

Multi brand management 25%
SEO depth 20%
Output quality 20%
Scale and seats 20%
Value 15%
01
RANK
★ Editor’s Choice

Jasper

Best for many client brands

Agencies juggle a dozen brand voices, and Jasper handles that better than anything else here. Per client brand voices, workspaces and roles keep work separated and consistent, and the drafts need less rework before a client sees them. The per seat cost adds up across a roster, so the math works best when content volume is high.

  • Separate brand voices per client
  • Workspaces and seats
  • Reliable on brand drafts
Read the Jasper verdict → From $59/seat/mo (annual) · no free plan
89
OUT OF 100
02
RANK

Writesonic

Best for SEO deliverables

A workhorse for agencies producing search content at volume for many clients. SEO tooling and a fair price per seat make margins easier. Brand separation is weaker than Jasper, so larger rosters need discipline.

Read the Writesonic verdict → From $16/mo · free plan
87
OUT OF 100
03
RANK

Surfer SEO

Best for optimization services

If your deliverable is rankings, Surfer is the scoreboard clients understand. It grades and guides content against the SERP and packages well into reports. It does not draft from scratch, so pair it with a writer.

Read the Surfer SEO verdict → From $79/mo (annual) · no free plan
86
OUT OF 100
04
RANK

Copy.ai

Best for client GTM work

Useful when the agency runs outreach and campaigns, not just blogs. Workflows scale repetitive client copy and the seat pricing is friendly. Long form and per client brand control are where it trails.

Read the Copy.ai verdict → From $49/mo · free plan
84
OUT OF 100
05
RANK

Frase

Best for briefs and outlines

Speeds the part of agency work clients rarely see: research and briefs that keep writers aligned. Strong SERP analysis and outline tooling. Limited seats and average raw generation cap it for big teams.

Read the Frase verdict → From $39/mo (annual) · no free plan
82
OUT OF 100

Pricing verified as of June 2026. Vendors change plans often · check the vendor for current pricing.

At a glance

✓ full  ·  ∼ partial  ·  — none
Capability JasperWritesonicSurfer SEOCopy.aiFrase
Free plan
Long form blog editor
Brand voice and custom tone
Built in SEO optimization
Team collaboration
Open API access